Erlang was built from the ground up, to get distributed, & fault-tolerant computing "right". Elixir inherits these qualities, & packages it up in a beautiful modern language, with excellent tooling & access to all the existing Erlang libraries.

In the event you need to understand how Whatsapp, with less than 60 engineers, can send double the text messages of all the Telecoms companies put together, then come & learn Elixir. It is going to be fun!